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/*Copyright (c) 2011, Florent DEVILLE.                                      */
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#pragma once

#include "RTIPrimitive.h"

namespace RT
{
	/*A box primitive*/
	class RTPrimBox : public RTIPrimitive
	{
	private:
		/*Box' width*/
		F32 m_width;

		/*Box' height*/
		F32 m_height;

		/*Box' depth*/
		F32 m_depth;

		/*Array of vertex storing the coordinates of the 8 points composing the box*/
		RTVector3f m_vertex[8];
		
		/*Id of the face intersecting with the ray*/
		I32 m_idHitFace;

	public:

		/*Constructor*/
		RTPrimBox(F32 width, F32 height, F32 depth);

		/*Destructor*/
		~RTPrimBox();
	
		/*Check intersection between this primitive and a ray*/
		bool intersect(const RTRay& ray, F32& dist, bool useGlobalCoordinates);

		/*Calculate the normal of the primitive in a given point*/
		void computeNormal(const RTRay& ray, F32 dist, RTVector3f& normal)const;

		/*Check if the point is inside the primitive*/
		bool isInside(const RTVector3f& p)const;

	private:
		/*Check if a ray intersect with a face of the box*/
		bool intersectRayWithFace(const RTRay& r, const RTVector3f& p0, const RTVector3f& p1, const RTVector3f& p2, F32& dist)const;

	};
}